<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>原生实现hash和browser两种路由模式</title>
</head>
<body>
    <div class="router_box">
        <a href="/home" class="router" replace="true">主页</a>
        <a href="/news" class="router">新闻</a>
        <a href="/team" class="router">团队</a>
        <a href="/about100" class="router">关于</a>
    </div>
    <div id="router-view"></div>

    <script>
        function Router(params){
            // 记录routes配置
            this.routes = params.routes || [];
            // 记录路由模式
            this.mode = params.mode || 'hash';

            // 初始化
            this.init = function(){
                // 绑定路由响应事件
                var that = this;
                document.querySelectorAll(".router").forEach((item,index)=>{
                    item.addEventListener("click",function(e){
                        // 阻止a标签的默认行为
                        if ( e && e.preventDefault ){
                            e.preventDefault(); 
                        }else{
                            window.event.returnValue = false;  
                        } 
                        
                        if (that.mode == 'hash'){
                            // 判断是replace方法还是push方法
                            if (this.getAttribute("replace")){
                                var i = window.location.href.indexOf('#')
                                // 通过replace方法直接替换url
                                window.location.replace(
                                    window.location.href.slice(0, i >= 0 ? i : 0) + '#' + this.getAttribute("href")
                                )
                            }else{
                                // 通过赋值追加
                                window.location.hash = this.getAttribute("href");
                            }
                        }else{
                            if (this.getAttribute("replace")){
                                window.history.replaceState({}, '', window.location.origin+this.getAttribute("href"))
                            }else{
                                window.history.pushState({}, '', window.location.origin+this.getAttribute("href"))
                            }
                            // 手动调用更新内容方法
                            that.routerChange();
                        }
                        
                    }, false);
                });
                // 监听路由改变
                if (this.mode == 'hash'){
                    window.addEventListener("hashchange",()=>{
                        this.routerChange();
                    });
                }else{
                    window.addEventListener('popstate', e => {
                        console.log(123);
                        this.routerChange();
                    })
                }
            },

            // 路由改变监听事件
            this.routerChange = function(){
                if (this.mode == 'hash'){
                    let nowHash=window.location.hash;
                    let index=this.routes.findIndex((item,index)=>{
                        return nowHash == ('#'+item.path);
                    });

                    if(index>=0){
                        // 查找到对应路由
                        document.querySelector("#router-view").innerHTML=this.routes[index].component;
                    }else {
                        // 没找到对应路由，查找有没有*
                        let defaultIndex=this.routes.findIndex((item,index)=>{
                            return item.path=='*';
                        });
                        // 查找到*，执行重定向
                        if(defaultIndex>=0){
                            const i = window.location.href.indexOf('#')
                            window.location.replace(
                                window.location.href.slice(0, i >= 0 ? i : 0) + '#' + this.routes[defaultIndex].redirect
                            )
                        }
                    }
                }else{
                    let path = window.location.href.replace(window.location.origin, '');
                    let index=this.routes.findIndex((item,index)=>{
                        console.log('path...', path, 'item.path...', item.path);
                        return path == item.path;
                    });
                    if(index>=0){
                        // 查找到对应路由
                        document.querySelector("#router-view").innerHTML=this.routes[index].component;
                    }else {
                        // 没找到对应路由，查找有没有*
                        let defaultIndex=this.routes.findIndex((item,index)=>{
                            return item.path=='*';
                        });
                        // 查找到*，执行重定向
                        if(defaultIndex>=0){
                            window.history.replaceState({}, '', window.location.origin+this.routes[defaultIndex].redirect)
                            this.routerChange();
                        }
                    }
                }
            }
           
            // 调用初始化
            this.init();
            // 匹配路由
            this.routerChange();
        }
        new Router({
            mode: 'history',
            routes:[
                { path: '/home', component: '<h1>主页</h1><h4>新一代前端工程师：我们啥都会</h4>' },
                { path: '/news', component: '<h1>新闻</h1><h4>今天2018-11-5，上课还得穿工装</h4>' },
                { path: '/team', component: '<h1>团队</h1><h4>WEB前端工程师</h4>' },
                { path: '/about', component: '<h1>关于</h1><h4>一面而高薪就业</h4>' },
                { path:'*', redirect:'/home'}
            ]
        });
    </script>
</body>
</html>